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Build an XML Web Service

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Build an XML Web Service

Overview of Part 1

In this part, we値l build our first XML Web service in Visual Studio .NET. The Web service will demonstrate one of the key benefits of using XML Web services: Integration of disparate data sources into an easy to use data object. We値l unite two different data sources, XML and SQL Server, into a single ADO.NET object called a DataSet. The DataSet serializes automatically as XML, and is returned by the XML Web service.




XML Web services form the core business logic in the .NET application model. In an upcoming section, we値l write a Microsoft Visual Basicョ .NET program based on Microsoft Windowsョ that will use this Web service. Then, we値l create Web and mobile interfaces as well. In each case, the logic in the XML Web service will serve as the core of the application, running separately from whatever presentation model we choose as appropriate for the situation.

After finishing the Guided Tour, you値l have a good understanding of the importance and power of XML Web services, and how Microsoft Visual Studioョ .NET enables developers to quickly and easily build Web services, and incorporate them into business applications.

Part 1: Build an XML Web Service

Step 1 of 7: Add new Web service file

Adding a new file with the extension .asmx will instruct ASP.NET to treat the methods tagged with [WebMethod] as Web service calls.

a. In the Solution Explorer, right-click DownhillBikes, click Add, then click Add New Item .

b. In the Templates list, click the Web Service icon. Leave the default name Service1.asmx.

c. Click Open.

Part 1: Build an XML Web Service

Step 2 of 7: Add Customers table to the Web service

Using the RAD features of Visual Studio .NET, create a connection to the Customers table by dragging it from the Server Explorer.

a. From the View menu, click Server Explorer to open it. (Or, press CTRL+ALT+S.)

b. Expand the Servers tree and locate the Customers table (Servers サ computername サ SQL Servers サ computername サ bikes サ Tables).

c. Drag the Customers icon to the right, onto the design surface.

*   Optional

If you would like to preview the data in the Customers table, right-click the Customers icon, and click Retrieve Data from Table. This is an easy way to quickly verify or modify the data in the table. Close this window with CTRL+F4 before moving to the next step.

Part 1: Build an XML Web Service

Step 3 of 7: Add the Get and Update Web methods

The GetData Web method will return a DataSet that combines the SQL data from Customers, and the Order data from the Orders.xml file. The DataSet can then be manipulated easily on any tier of the application.

Even though these are two completely different kinds of data storage mechanisms, ADO.NET combines them into a disconnected in-memory DataSet for consumption by the XML Web service.

a. From the View menu, click Code. F7

b. Click on the empty line above the comment:

// WEB SERVICE EXAMPLE

This will position the insertion point in the right spot so that we can insert some code.

c. From the View menu, click Toolbox. Or, press CTRL+ALT+X.

d. Click the Guided Tour tab then double-click 1.3 WebService methods item to insert the code.

*   Optional

You can remove the four [LLR1] comment tags (//) before HelloWorld() as shown in the following picture and recompile to see a simple WebMethod example.

Part 1: Build an XML Web Service

Step 4 of 7: Build and test the Web service

Here we build the page and test the Web service using a test page generated automatically by ASP.NET. This will allow us to see the data returned from the two data sources and show the results in a simple Web page. This is how quickly and easily you can build and deploy an XML Web service with Visual Studio .NET!

a. From the File menu, click Build and Browse. CTRL+F8

b. Click the GetData hyperlink, then click Invoke.

c. Examine the resulting schema and data for all customers and their orders.



Part 1: Build an XML Web Service

Step 5 of 7: Add a new performance counter

Using the Visual Studio .NET RAD server features, components and server-side resources, such as performance counters and message queues, are wrapped with programmatic interfaces, making them easy to program.

In this step, we値l create a custom performance counter that will keep track of the number of times per second the new Web service method GetData is accessed.

a. From the View menu, click Server Explorer. CTRL+ALT+S

b. Expand the Servers tree and locate the Performance Counters (Servers サ computername サ Performance Counters).

c. Right-click Performance Counters and click Create New Category.

d. In the Category name box, type: bikes

e. Click New.

f. Change the Type list from NumberOfItems32 to RateOfCountsPerSecond32. We値l go with the default name CounterName. Click OK.

Part 1: Build an XML Web Service

Step 6 of 7: Use the performance counter

Now we will update the performance counter by invoking it in our GetData method. One line of code is all we need to update the performance counter. Prior to Visual Studio .NET, simple steps such as these required hundreds of lines of code.

a. In the Solution Explorer, right-click Service1.asmx and click View Designer.

b. From the View menu, click Server Explorer. CTRL+ALT+S

c. Expand the new bikes performance counter to locate CounterName. (Performance Counters サ bikes サ CounterName). Drag the CounterName icon to the design surface.

d. Press F4 to view the properties of the performanceCounter1 object. Double-click the ReadOnly property to change it to False.

e. Press F7 to view the code.

f. Place the insertion point right before the return dataset line in the GetData() method.

g. In the Toolbox, click the Guided Tour tab then double-click the 1.6 hit rate counter item.

Part 1: Build an XML Web Service

Step 7 of 7: Test the performance counter

Now we値l show the performance counter in action by watching the counter increment as we use the XML Web service.

a. Double-click hit_rate.msc in the Solution Explorer window. CTRL+ALT+L

b. Switch back to Visual Studio .NET, and press CTRL+F8 to build and browse the Web service.

c. Click the GetData hyperlink. Click Invoke. Press the Refresh icon (Located on the left side of the toolbar) several times to requery the Web service.

d. Switch to PerfMon and you should see the performance counter move up and down, showing the number of requests per second this page is handling.

e. Close PerfMon (don稚 save the changes) and all browser windows.

f. In Visual Studio .NET, from the Window menu, click Close All Documents. If asked to save changes, click Yes.

Summary

In this first exercise you have accomplished many of the tasks that will drive the next generation of computing. You have built and deployed an XML Web service. You added business logic and database connectivity using the Visual Studio .NET Server Explorer. Most importantly, you created this XML Web service in minimal time using the RAD skills that today痴 developers already have. Now that we have constructed and tested our XML Web service, we will build a series of client experiences that integrate the Web service into their functionality.


 [LLR1] I see only FOUR comment tags below. I致e queried this in the first set of Parts docs too. Can this be fixed across all?






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